Question

我有这段代码

private void startActionPerformed(java.awt.event.ActionEvent evt) {                                      
    this.start.setBackground(Color.green);
    this.stop.setBackground(Color.lightGray);
    if (!stopped) {
        timer.cancel();
    }
    stopped = false;
    stato.setText("Avviato");
    timer = new Timer();
    if(giacRitardo>0)
        timer.schedule(S.run("argiacenze"), giacRitardo, giacRitardo);//parti dopo x secondi e itera ogni x secondi
    if(cliRitardo>0)
        timer.schedule(S.run("arclienti"), cliRitardo, cliRitardo);//parti dopo x secondi e itera ogni x secondi

//其他一些代码

和

class TaskSchedulato extends TimerTask {

    @Override
    public void run() {
        redirectSystemStreams();
        DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        URL sito = null;
        try {
            sito = new URL(sUrl + "?aggiornamento=arlingue");
        } catch (MalformedURLException ex) {
            System.out.println("Indirizzo del sito mal formato o inesistente");
        }
        URLConnection yc = null;
        try {
            yc = sito.openConnection();
        } catch (IOException ex) {
            System.out.println("Errore di connessione _ ");
        }
        BufferedReader in = null;
        try {
            in = new BufferedReader(
                    new InputStreamReader(
                            yc.getInputStream()));
        } catch (IOException ex) {
            Logger.getLogger(TaskSchedulato.class.getName()).log(Level.SEVERE, null, ex);
        }
        String inputLine;
        try {
            while ((inputLine = in.readLine()) != null) {
                System.out.println(inputLine);
            }
        } catch (IOException ex) {
            Logger.getLogger(TaskSchedulato.class.getName()).log(Level.SEVERE, null, ex);
            dataErrore = new Date();
            System.out.println(sdf.format(dataErrore));
            System.out.println("Errore di connessione: " + dataErrore);
        }
        try {
            in.close();
        } catch (IOException ex) {
            Logger.getLogger(TaskSchedulato.class.getName()).log(Level.SEVERE, null, ex);
        }

    }
}

和

TaskSchedulato S = new TaskSchedulato();

我需要扩展上面运行的方法，以便我可以传递一个字符串参数。怎么做呢。我几乎是java中的新星。所以，请原谅我缺乏经验。

其实我收到错误：找不到合适的运行方法（String）方法TimerTask.run（）不适用（实际和正式的参数列表长度不同）方法MainForm.TaskSchedulato.run（）不适用（实际和正式的参数列表长度不同）

提前谢谢

Answer 1

使用method overloading可以轻松实现这一目标。

简而言之，方法重载是一种语言功能，它允许声明具有相同名称但参数不同的多个方法。

应用于您的问题，而不是覆盖父{q} run()方法，只需声明另一个run()方法，如下所示：

public void run(String someInput) {
    /* ... */
}

当然，如果您的计划有意义，可以在run()内拨打run(String)：

public void run(String someInput) {
    /* Do something with someInput */
    run(); // Hand over to parent's run() method
    /* Maybe do some other stuff */
}

根据您要执行的操作，您可能希望同时使用方法重载和覆盖。需要更多的背景来提供更具体的建议。

Answer 2

I solved this way

class TaskSchedulato extends TimerTask {
    String stringa;
    public TaskSchedulato(String stringa){
        this.stringa=stringa;
    }
    @Override
    public void run() {
    //code here
    }

Thanks to @onurbaysan for the answer in the thread below How to Pass Arguments to Timertask Run Method

Answer 3

@domdom， timer.schedule的签名是 schedule（TimerTask任务，长延迟，长时间段）

我已经在我的程序的工作版本中使用它了

private void startActionPerformed(java.awt.event.ActionEvent evt) {                                      
    this.start.setBackground(Color.green);
    this.stop.setBackground(Color.lightGray);
    if (!stopped) {
        timer.cancel();
    }
    stopped = false;
    stato.setText("Avviato");
    timer = new Timer();
    if(giacRitardo>0)
        timer.schedule(new TaskGiacenze(), giacRitardo, giacRitardo);
    if(cliRitardo>0)
        timer.schedule(new TaskClienti(), cliRitardo, cliRitardo);
    if(artRitardo>0)
        timer.schedule(new TaskArticoli(), artRitardo, artRitardo
    //..........

和

class TaskGiacenze extends TimerTask {

    @Override
    public void run() {
        redirectSystemStreams();
        DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        URL sito = null;
        try {
            sito = new URL(sUrl + "?aggiornamento=argiacenze");
        } catch (MalformedURLException ex) {
            System.out.println("Indirizzo del sito mal formato o inesistente");
        }
        URLConnection yc = null;
        try {
            yc = sito.openConnection();
        } catch (IOException ex) {
            System.out.println("Errore di connessione _ ");
        }
        BufferedReader in = null;
        try {
            in = new BufferedReader(
                    new InputStreamReader(
                            yc.getInputStream()));
        } catch (IOException ex) {
            Logger.getLogger(TaskGiacenze.class.getName()).log(Level.SEVERE, null, ex);
        }
        String inputLine;
        try {
            while ((inputLine = in.readLine()) != null) {
                System.out.println(inputLine);
            }
        } catch (IOException ex) {
            Logger.getLogger(TaskGiacenze.class.getName()).log(Level.SEVERE, null, ex);
            dataErrore = new Date();
            System.out.println(sdf.format(dataErrore));
            System.out.println("Errore di connessione: " + dataErrore);
        }
        try {
            in.close();
        } catch (IOException ex) {
            Logger.getLogger(TaskGiacenze.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

但是我必须为每种类创建一个类（giacenze的一个类，articoli的另一个类等等......）而不是将其作为参数调用。

如何在TimerTask中扩展方法运行。必须接受字符串参数

3 个答案: